The weather in Koh Tao in September is hot. The average temperatures are between 22°C and 31°C.
There’s going to be many days of rain during the month of September in Koh Tao.
Koh Tao should expect an average of 15 to 22 days of rain, so be sure to bring along a waterproof jacket to stay dry this month!
Our weather forecast can give you a great sense of what weather to expect in Koh Tao in September 2025.
If you’re planning to visit Koh Tao in the near future, we highly recommend that you review the 14 day weather forecast for Koh Tao before you arrive.
Temperatures
31° / 22°
Rainy Days
18
Snowy Days
0
Dry Days
12
Rainfall
380
mm
Sun Hours
9.7
Hrs
